The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 03, 2020
Filed:
May. 12, 2016
Applicant:
Sony Corporation, Tokyo, JP;
Inventors:
Noboru Sekiguchi, Miyagi, JP;
Tomoe Ozaki, Miyagi, JP;
Tetsuo Endo, Miyagi, JP;
Takashi Aizawa, Miyagi, JP;
Junichi Tachibana, Miyagi, JP;
Hikaru Terui, Miyagi, JP;
Teruo Sai, Miyagi, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B 5/667 (2006.01); G11B 5/66 (2006.01); G11B 5/733 (2006.01); G11B 5/65 (2006.01); G11B 5/70 (2006.01); G11B 5/73 (2006.01);
U.S. Cl.
CPC ...
G11B 5/667 (2013.01); G11B 5/65 (2013.01); G11B 5/653 (2013.01); G11B 5/656 (2013.01); G11B 5/66 (2013.01); G11B 5/70 (2013.01); G11B 5/733 (2013.01); G11B 5/73925 (2019.05); G11B 5/73935 (2019.05);
Abstract
A magnetic recording medium has a recording surface having an average surface roughness SRa of 3.0 nm or less, the number of projections having a height of 7.5 nm or more included in a unit region (where the unit region is a square region with each side having a length of 30 μm) of the recording surface is 256 or more, and the number of projections having a height of 15 nm or more included in the unit region of the recording surface is 0 or more and 104 or less.